| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] to ensure that [art] | 65 |
|
| 2 | [adv] as to ensure that | 23 |
|
| 3 | as to ensure that [art] | 14 |
|
| 4 | [adv] as to ensure [art] | 9 |
|
